[#1230] Prepare releng for 2.9.0 release

[zelenyhleb]

Swtich baseline to 2.8.0

Fixes #1230

[codecov]

Codecov Report

Merging #1235 (39e84f1) into master (bf3e456) will decrease coverage by 0.01%.
The diff coverage is n/a.

❗ Current head 39e84f1 differs from pull request most recent head 16c0d43. Consider uploading reports for the commit 16c0d43 to get more accurate results

@@             Coverage Diff              @@
##             master    #1235      +/-   ##
============================================
- Coverage     33.48%   33.47%   -0.01%     
  Complexity      359      359              
============================================
  Files          1175     1175              
  Lines         25744    25744              
  Branches       1590     1590              
============================================
- Hits           8620     8618       -2     
- Misses        16603    16604       +1     
- Partials        521      522       +1     

see 2 files with indirect coverage changes

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[ruspl-afed]

please compare baseline target with current target,
"baseline target" = "current target content in its release state" + "latest released Passage"

[ruspl-afed]

LGTM